76 entries under hard topic. ×
| impenetrable(adjective, set, tough, firm) | |
| impermeable(adjective, set, tough, firm) | |
| inelastic(adjective, tough, solid, rigid) | |
| inflexible(adjective, set, strong, tough) | |
| nonporous(tough, solid, rigid, inflexible) | |
| rigid(adjective, set, strong, complete) | |
| set(verb, adjective, strong, tough) | |
| solidified(verb, adjective, set, tough) | |
| substantial(adjective, set, strong, tough) | |
| unyielding(adjective, set, tough, firm) | |
| biting(adjective, strong, great, severe) | |
| bold(adjective, sharp, bright, high) | |
| close-grained(adjective, set, tough, firm) | |
| congealed(verb, adjective, set, tough) | |
| effective(adjective, sharp, bright, regular) | |
| hardened(verb, adjective, set, strong) | |
| hefty(adjective, strong, tough, powerful) | |
| hot(adjective, sharp, bright, intense) | |
| husky(adjective, strong, tough, vigorous) | |
| impervious(adjective, set, tough, solid) |
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| APA | Smart Define. (2015). concentrated thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/concentrated/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "concentrated thesaurus" https://smartdefine.org/concentrated/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, concentrated thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/concentrated/thesaurus/synonyms>. |
| MLA | Smart Define. "concentrated thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/concentrated/thesaurus/synonyms> |